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对于 $q 这个服务。
提供如下方法:
defer
var defer = function(){ return Deferred(); }
对于defer ,拥有的方法有。
var defer = $q.defer(); // defer 对象。 defer.resolve(value) // defer.reject(reason) // defer.notify(value) // var promise = defer.promise; ////// promise 对象。 promise.then(successCallback,errorCallback,notifyCallback); promise[catch](errorCallback); promise[finally](callback,notifyCallback)
reject
var reject = function(reason){ var result = new Deferred(); result.reject(reason); return result.promise; }
when
var when = function(value,callback,errback,progressBack){ var result = new Deferred(); result.resolve(value); return result.promise.then(callback,errback,progressBack); }
resolve
var resolve = when
all
var all = function(promises){ var deferred = new Deferred(); var counter = 0; var results = isArray(promises)? []:{}; forEach(promises,function(promise,key){ counter++; when(promise).then( function(value){ if(results.hasOwnProperty(key)) return ; results[key] = value; if(!(--counter)) deferred.resolve(results); }, function(reason){ if(results.hasOwnProperty(key)) return; deferred.reject(reason); } ); }); if(counter === 0){ deferred.resolve(reaults); } return deferred.promise; }
对于q 方法
var $Q = function Q(resolver){ if(!(this instanceof Q)){ return new Q(resolver); } var deferred = new Deferred(); function resolveFn(value){ deferred.resolve(value); } function rejectFn(reason){ deferred.inject(reason); } resolver(resolveFn,rejectFn); return deferred.promise; }
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原文地址:http://my.oschina.net/bosscheng/blog/516264